The Giants outfield, Gregor Blanco (left), Nori Aoki and Hunter Pence congratulated teammates after the victory. The San Francisco Giants defeated the Milwaukee Brewers 5-0 to take the series at AT&T Park Wednesday July 29, 2015. less

The Giants outfield, Gregor Blanco (left), Nori Aoki and Hunter Pence congratulated teammates after the victory. The San Francisco Giants defeated the Milwaukee Brewers 5-0 to take the series at AT&T Park ... more

The Giants have won 13 of 15, but temperatures will top 100 degrees during their visit here this weekend, a sign of things to come in August when the reigning World Series champs play their toughest part of the schedule in perhaps the season’s toughest climate conditions.

Did we mention the Rangers’ ballpark is without a retractable roof?

Next after Texas are three games in Atlanta: anticipated highs in the mid-90s. Isolated thunderstorms anticipated on getaway day, of course.

Followed by four in Chicago: high 70s, a break. But, oh, the humidity. Again, scattered thunderstorms are in the forecast on getaway day, and we would hope the Cubs’ grounds crew would properly tarp the field this time.

Nothing like August baseball in the South and Midwest, and that’s not the half of it. After stops in Texas and Atlanta, the Giants play eight consecutive series against teams currently in first place (Astros, Nationals, Cardinals, Cardinals again, Dodgers) or in the wild-card race (Cubs, Pirates, Cubs again).

Of the 29 games in 31 days in August, 17 are on the road. One of the two off-days follows a Sunday night game in Pittsburgh, and we all know how much the Giants love all-night, coast-to-coast travel.

After this three-city, 10-game trip that concludes at Wrigley Field, the Giants play Houston and Washington at home. Then another hot-and-humid tour through St. Louis and Pittsburgh. And back home against the Cubs and Cardinals.

On the month’s final day, the Giants are at Dodger Stadium.

Manager Bruce Bochy said he needs to be careful how much he plays his regulars in August, including catcher Buster Posey, who sat out Wednesday’s game, giving him a two-day break heading to Texas. Second baseman Joe Panik is expected to play Friday’s opener after missing two games with lower back tightness.

Asked about being more conscious of players’ durability in August, Bochy said, “I think you have to be. These are getting into the old dog days with the travel and hot weather and trying to keep these guys as fresh as I can.

“It probably caught up with Joe a little bit, to be honest. He’s been out there every day and really hasn’t had a break. Now he’s got a stiff back, so it’s just a reminder these guys are human and need an occasional break.”

Don’t expect the Giants to continue playing .867 ball in August. In private, they’d probably be satisfied, if not overjoyed, going around .500 in the month. That would leave them in the 70-60/71-59 neighborhood entering September, still very much in the playoff hunt.

Again, no easy task.

After August, the load lightens significantly. Other than six games against the Dodgers, the Giants play nothing but teams currently below .500, including the three worst teams in their division (Diamondbacks, Padres, Rockies), along with the Reds and A’s.

“Every game is huge right now,” Hunter Pence said. “You work all season to come down to these last couple of months.”